Dear All,
we were wondering if knows of an Escherichia coli B strain that is Rec deficient (Rec-).
We want to compare certain properties of E coli B and K12, and for the experiment it would be best to use a Rec- variant.
We have TOP10, which is a K12 derivative that is Rec-, but derivatives of B like BL21 are Rec+.
Have a happy Easter,
Mark
Mark J van Raaij
Lab 20B
Dpto de Estructura de Macromoleculas
Centro Nacional de Biotecnologia - CSIC
c/Darwin 3
E-28049 Madrid, Spain
tel. (+34) 91 585 4616
http://www.cnb.csic.es/~mjvanraaij
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